Rh blood group system - Wikipedia
The term "Rh" was originally an abbreviation of "Rhesus factor". It was discovered in 1939 by Karl Landsteiner and Alexander S. Wiener, who, at the time, believed it to be a similar antigen found in …
Rhesus (Rh) Factor: Incompatibility, Complications & Pregnancy
The Rhesus factor, or Rh factor, is a certain type of protein found on the outside of red blood cells. People are either Rh-positive (they have the protein) or Rh-negative (they don’t have the protein). …
Rh Factor Explained - Red Cross Blood
Jun 27, 2023 · The positive or negative sign next to the blood groups is known as the Rhesus (Rh) factor. The Rh factor is an inherited protein that can be found on the surface of the red blood cell.
What Is the Rhesus Gene and How Does It Work?
Jul 25, 2025 · The Rhesus (Rh) factor is a protein found on the surface of red blood cells. Its presence or absence classifies an individual’s blood as either Rh-positive or Rh-negative. This classification is …
Rh factor blood test - Mayo Clinic
Apr 30, 2025 · Rh factor is an inherited protein found on the surface of red blood cells. If your blood has the protein, you're Rh positive. If your blood doesn't have the protein, you're Rh negative. The "+" or …
What Is Rhesus Disease and Why It Matters
Jun 5, 2025 · Many people have never heard of Rhesus disease, but it can be dangerous for unborn babies if not detected early. Rhesus disease happens when a woman has Rhesus-negative (Rh–) …
Rh blood group | Definition, Rh Factor, & Rh Incompatibility - Britannica
Dec 18, 2025 · The designation Rh is derived from the use of the blood of rhesus monkeys in the basic test for determining the presence of the Rh antigen in human blood. The Rh blood group system was …
Understanding Rhesus Blood Groups - A Complete Guide - RhMPG
Comprehensive guide to the Rhesus blood group system, including discovery, genetics, clinical significance, and population variations. Essential reading for healthcare professionals and students.
What Is Rh Factor? | Ask A Biologist
Sep 8, 2023 · It’s called the rhesus factor. Sometimes the blood of an Rh positive (Rh+) fetus comes into contact with the blood of an Rh negative (Rh-) pregnant person. That can cause health problems for …
Rh Factor: Effect on Pregnancy, Risks, Screening, and More
Jun 27, 2022 · What is the Rh factor? Doctors use the Rhesus factor, or Rh factor, in blood typing. It refers to a protein that can be outside your red blood cells. The positive or negative sign next to the …